Dredge.



J. CARLESIMO.

DREDGE.

APPLICATION FILED NOV. 8, 1907.

Patented Sept. 21, 1909.

r mi ant JULIO CARLESIMO, OF BUENOS AYRES, ARGENTINA.

DREDGE.

Specification of Letters Patent.

Patented Sept. 21, 1909.

Application filed November 8, 1907. Serial No. 401,312.

To all whom it may concern:

Be it known that I, JULIO OARLnsIMo, a subject of the King of Italy, residing at Buenos Ayres, Argentina, have invented a new and useful Dredge, of which the following is a full, clear, and exact description.

The present invention relates to improvements in dredges in which the dredging of the material is effected by means of suction created by forming a vacuum in a closed chamber and it has for its object to provide means for carrying off the water drawn in with the dredged material.

In dredging by suction, the necessary force for elevating the material is usually generated by a turbine which proves efficient for elevating loose or disintegrated materials, such as sand and pebbles, but not in the sucking up of compact clays. When working in the latter, the adhesion of the material to the paddles of the turbine increases as the work progresses and although the centrifu gal force and peripheral speedbe increased a considerable as well as useless disgregation ofv the material takes place and the extracting capacity of the turbine is often completely rendered. null. As the turbine has no retention valve the force must be produced continuously either for supporting the weight of the column of material forced up, or for maintaining the dynamical vacuum within the upper end of the suction pipe and owing to an obturation in the circuit of the pipes, effective dredging is rendered null. Finally, the radial and lateral interspace between the paddles and the casing of the turbine must be increased according to the increase in the peripheral speed, and this will allow the return of considerable of the material already pushed along and the draft in the suction will thus be decreased.

In the accompanying drawings, Figure 1 is a diagrammatical longitudinal section of a dredge embodying one form of my invention. Fig. 2 is a cross section of the same. Fig. 3, a plan view. Fig. 4 a diagrammatical longitudinal section of a modified construction and Fig. 5 a cross section of Fig. l.

In said drawings, A designates a scow or barge in which is formed a closed chamber 1 from which projects a suction-pipe 2, of sufficient length to reach the material to be dredged. The suction pipe is provided as usual with an enlarged suction head 9, the mouth of which is turned in the direction of travel of the scow as indicated by the arrows. When not in use the suction-pipe may be raised within a well 10, by suitable tackle as 11, and brace chains or ropes 12 connect the suction pipe with the bow of the scow during operations.

In the construction shown in Fig. 1 the air is exhausted from the chamber 1 by being sucked through an exhaust pipe 4 by means of a suction pump, not shown, and both the exhaust and suction pipes are preferably provided with valves 16 and 17 respectively.

It will readily be understood that when both valves 16 and 17 are opened and the suction pump is set in operation the material to be dredged together with a certain amount of water is drawn intothe chamber 1. When an excessive quantity of water has entered the chamber 1, said water may be drawn off at both the top and bottom of said chamber through suction pipes 18 and 19 which communicate with a suction pump 3. Valved conduits or pipes 13, 14; and 15 are provided in the sides of the chamber at the bottom thereof for the purpose of discharging the dredged material therefrom.

In the construction shown in Figs. 4 and 5, a suction-pump as 5 is placed in the suction pipe 2 and a pipe 2 connects said pump with a chamber 6. A. supplementary suction is created in the chamber 6 by means of the excessive water flowing out through a pipe 8. This pipe 8 is provided with a shut-off valve 22 and has its lower end submerged, which causes it to act as a siphon for drawing off the excess of water.

I claim:

1. A dredge having a closed chamber, a suction -pipe communicating therewith,

means to exhaust the air from said chamber and means to draw off the Water drawn in by the vacuum.

2. A dredge having a closed chamber,

a suction-pipe communicating therewith,

10 a suction-pipe communicating therewith, an

air-exhaust pipe, and a water-exhaust pipe communicating with said chamber at the top.

In testimony whereof I aflix my signature 1n the presence of two wltnesses.

JULIO OARLESIMO.

WVitnesses AUTO L. BELLO, JULIO DEL RIVIERE. 

